Engine compressor unit



March 20, 1956 P. ROUX 2,738,918

ENGINE COMPRESSOR UNIT Filed Dec 15. 1952 2 Sheets-Sheet 1 INVENTORY:- HER/1E Q0 0X HTT7 March 20, 1956 P. RouX' ENGINE COMPRESSOR UNIT 2 Sheets-Sheet 2 Filed Dec. 15. 1952 I VENToR-'- RERRE IQOUX ATTYS'.

United States Patent ENGINE COMPRESSOR UNIT Pierre Roux, Marseille, France Application December 15, 1952, Serial No. 326,055

Claims priority, application France November 14, 1952 2 Claims. (Cl. 230-56) The present invention relates to a combined engine and compressor unit, its main object being to provide an improved construction wherein the fuel mixture is fed to the motor through the crank-case and the compressor piston is made to act as an inlet valve for the mixture into the crank-case, the movement of the motor and compressor pistons serving for induction of the fuel mixture into and compression of it within the crank-case prior to feeding to the motor.

A second object is to provide a housing for the unit and an air impeller driven by the unit and serving to impel air through the housing for cooling purposes.

A construction of the combined motor and compressor is illustrated in the accompanying drawings, wherein: Fig. 1 is a central vertical section; Fig. 2 is a central vertical section, with parts in elevation, taken in a plane at right angles to the plane of Fig. 1.

In these drawings, on a casing 1 are mounted a motor cylinder 2 and a compressor cylinder 3 at 90 to each other. In the motor cylinder 2 is arranged a piston 4 coupled by a connection rod 5 to a crank-shaft 6. An exhaust port 7 is provided in the wall of the cylinder 2, the piston 4 serving as a valve for closing and opening said port. An inlet port 7a communicates between the cylinder 2 and the casing 1. A sparking plug (not shown) would be provided at the top of the cylinder 2.

The compressor cylinder 3 is provided with a compressor piston 8 coupled to the crank-shaft 6 by a connecting rod 9. An inlet conduit 10 serves for the fuel-air mixture to enter the cylinder 3 and pass to the casing 1.

At the upper part of the cylinder 3 is disposed an inlet port 11 for air to be compressed, and an outlet port 12 for leading the compressed air to a reservoir (not shown). The inlet and outlet ports are provided with non-return valves 11a and 12a.

About the entire casing 1 and most of the cylinders 2 and 3 is arranged a spaced air housing 15, and on a journal 14 of the crank-shaft there is carried an air impeller 13 mounted between the side Wall of the easing 1 and the adjacent side wall of the housing 15. 16 is an air inlet pipe leading to the impeller 13 and 17 is an outlet port for the air which is pumped through the housing by the impeller.

The operation is as follows: The motor acts on the two-stroke principle and receives its fuel through the inlet port 7a when the piston 4 is at the lower portion of its movement. During the explosion stroke the compressor piston closes the fuel mixture inlet 10 and compresses the mixture in the casing 1. As soon as the piston 4 gets near to its lowest point the exhaust gases are exhausted through the port 7, and after a further movement downwardly of piston 4 the port 7a is opened to allow compressed mixture into the cylinder 2.

The fuel mixture entering through inlet port 10 acts as a lubricant for the two pistons and connecting rod and crank-shaft assembly.

Patented Mar. 20, 1956 As the compressor piston 8 reciprocates it draws in air through port 11 and non-return valve 11a during each down-stroke, and forces it out again under pressure through port 12 and non-return valve 12a during each up-stroke.

During rotation of the crank-shaft the impeller 13 continuously draws in cooling air through air inlet pipe 16 and forces it through the entire space enclosed be tween the housing 15 and the casing 1 and cylinders 2 and 3, this air eventually passing out through the outlet port 17. The impeller 13 can serve also as a loW-pressure compressor if desired, connection being taken from the port 17 I claim:

1. An engine compressor unit comprising a crank-case, a motor cylinder thereon having an inlet port forming a communication between the motor cylinder at a point in its side wall and the crank-case, said motor cylinder having an exhaust port in its side wall, a motor piston slidably arranged in the cylinder for inward and outward strokes With respect to the crank-case and adapted to coact with the inlet and exhaust ports to form a valve therefor, the position of the inlet port and exhaust port being so arranged in the motor cylinder that the motor may operate with a 2-stroke cycle, a single-throw crank shaft journalled in the crank-case, a motor connection rod coupled between the crank shaft and the motor piston, a compressor cylinder on the crank shaft arranged with respect to the motor cylinder at an angle of less than in the radial plane of rotation of the crank shaft, said compressor cylinder having in its side Wall a fuel mixture inlet port for entry of fuel mixture into the compressor cylinder and crank-case, a compressor piston slidably arranged in the compressor cylinder for inward and outward strokes with respect to the crankcase, said compressor piston serving to coact with the fuel mixture inlet port to act as a valve therefor whereby the compressor piston uncovers the fuel mixture inlet port during its outward travel to allow fuel mixture to enter the crank-case by virtue of the suction created by the outward movement of the motor and compressor pistons, said compressor piston being adapted to cover the fuel mixture inlet port for a proportion of its inward stroke so as to compress the fuel mixture in the crankcase, a non-return air inlet valve and a non-return air outlet valve disposed on the compressor cylinder outwardly of the compressor piston and serving respectively for intake of air into the compressor cylinder during inward strokes of the compressor piston and for compression and forcing out of the air from the compressor cylinder during outward strokes of the compressor piston, and ignition means for the motor.

2. An engine compressor unit, as claimed in claim 1, including an air-tight housing arranged round and spaced from the motor and compressor cylinders and the crankcase and having an outlet port, and an air impeller secured on the journal of the crank shaft externally of the crank-case and between the crank-case and the housing, said impeller having an air inlet open to the external atmosphere and an outlet opening into the housing and serving to force cooling air through the housing.

References Cited in the file of this patent UNITED STATES PATENTS 2,394,904 Fowler Feb. 12, 1946 FOREIGN PATENTS 609,650 Great Britain Oct. 5, 1948 

